Patent GB-190514138-A (GB)
Title: Improvements in or relating to Jacks for Supporting and Positioning the Work in Machines used in the Manufacture of Boots and Shoes.
Inventor: BOULT ALFRED JULIUS
Filed: 1905-07-08
Granted: 1906-10-08
Abstract: 14,138. Boult, A. J., [United Shoe Machinery Co.]. July 8. Lasting; nailing; paring ; burnishing ; ornamenting; channelling; soles.-Relates to means for automatically actuating a shoe-supporting jack, so as to impart to the shoe which it carries the same movements as are imparted to a lasted shoe in the hands of an operator in being presented to the tools &c. of lasting, pegging, sewing, rounding and channelling, trimming, or finishing machines. These movements consist of a lateral rocking, longitudinal tilting, and lateral swinging, and they take place about a centre substantially coincident with the point of operation of the tool. The jack is supported so that it can rotate and also slide vertically in a sleeve on the free end of a swinging arm 16, which is connected by a pivoted link 18 to a bracket 19, secured to a carriage 20. This enables the jack to be moved to transfer the point of operation of the tool round the shoe, to bring the edge of the sole &c. into the desired position with relation to the line of feed. These movements are effected from a pattern or templet 24, removably held in a dovetailed groove 23 on the lower face of a plate 21, the upwardlyprojecting spindle of which is splined into the tubular spindle 15 of the jack. This templet is provided with a downwardly-projecting flange, with which spring-pressed guide-rollers or disks 29, 30, 31 are arranged to co-operate. The rollers 30, 31 bear against the outer edge of the flange, and the roller 29 against its inner edge midway between the other two. Above the flange, the templet is provided with ratchet teeth 37, which are engaged by a spring pawl carried by a lever 39 pivoted to the carriage 20. The other end of the lever 39 is adjustably connected to a lever 40, also pivoted to the carriage 20, but provided with a roller which engages a cam 42 secured to a shaft 43 journaled in the carriage. This shaft is driven by bevel-gearing from a short shaft 44, which is connected by a telescopic rod 45 and universal joints to another short shaft 11, to which motion is communicated from the main shaft 2 of the machine. The jack is fed forwards with a stepby-step movement, and at the same time the rollers 29, 30, 31 cause it to swing laterally, the rollers being placed so that the latter movement takes place about an axis passing through the point of operation of the tool. The shoe is kept at the proper elevation at all times to be acted upon by the tool by rollers mounted on a spring- pressed frame 46, which is pivoted to the arm 16. In order to rock the jack laterally and tilt it longitudinally, so as to bring the bottom of the sole &c. into the desired plane, the carriage 20 is provided with rollers 51, which travel in guideways 52 in a second carriage 53, the latter being also provided with rollers 54 adapted to travel in guideways 55 on a frame 56. The guideways 52, and also those in the frame 56, are curved in the arcs of circles, the centres of which are in a line passing through the point of operation of the tool. To effect the movement of the carriage 20, it has secured to it a curved rack 57, which gears with a bevel-wheel 58 carried by a shaft 59 journaled in the carriage 53. The shaft 59 is connected by a universal joint to a shaft 60, which is also connected by a universal joint to a short shaft 61. A pinion 62 carried by the latter meshes with a segmental gear 63 having a slotted arm 65, with which an adjustable block pivoted to a link 67 engages. The other end of this link is pivotally connected to a roller 68 rotatably mounted on the lower end of a lever 69 pivoted to the machine frame, this lever being also fitted with a second roller which engages a groove in the face of a cam secured to a shaft 7. The latter is rotated by worm gearing 5, from a shaft 4 driven by bevel-gearing from the main shaft 2. The carriage 53 is actuated through a series of pivoted levers 70, 71, 73, 74 by the engagement of a roller carried by the lever 74 with another cam 8 secured to the shaft 7. The frame 56 is normally held in its raised position by a spring 75, but it can be swung outward from the machine for convenience in fitting the shoe upon the jack. The shaft 4 is supported at one end in a bearing pivotally mounted on the shaft 2, and the other in a bearing adjustably secured to the machine frame. This enables the worm gears to be changed when the forms and templets are changed. For automatically throwing the jack-actuating mechanism out of gear after the point of operation of the tool has been transferred round the shoe, the worm gear carries a lng 81 which engages an arm 82 secured to a rod 83, and causes a wedge-shaped roller to separate the clutch collars carried by the shaft 2 and its driving-pulley. A starting-treadle 88 is fitted to the rod 83. Specifications No. 827, A.D. 1856, and No. 2651, A.D. 1857, are referred to.